摘要：條件語句例條件應用請輸入用戶名請輸入密碼歡迎登陸用戶名或密碼錯誤例條件條件應用請輸入你的性別男傻，自己性別都忘了女你在想想，你忘了你已經(jīng)做了手術了嗎人妖循環(huán)語句條件開始下一次循環(huán)跳出所有循環(huán)例請輸入用戶名請輸入
1 條件語句
例1：
if 條件:
...
else:
...
應用
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
username = input("請輸入用戶名：")
password = input("請輸入密碼：")
if username == "fcc" and password == "123":
print("歡迎登陸！")
else:
print("用戶名或密碼錯誤！")
例2:
if 條件：
...
elif 條件:
...
else:
...
應用：
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
sex = input("請輸入你的性別：")
if sex == "男":
print("傻x，自己性別都忘了!")
elif sex == "女":
print("...你在想想，你忘了你已經(jīng)做了手術了嗎...")
else:
print("人妖.......")
2 循環(huán)語句
while
while 條件:
continue # 開始下一次循環(huán)
break # 跳出所有循環(huán)
例：
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
i = 0
while i < 3:
username = input("請輸入用戶名：")
password = input("請輸入密碼：")
if username == "fcc" and password == "123":
print("歡迎登陸！")
break
else:
print("用戶名或密碼錯誤")
i += 1
3 練習
使用while循環(huán)輸入 1 2 3 4 5 6 8 9 10
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
i = 1
while True:
if i == 7:
i += 1
continue
print(i)
i += 1
if i == 11:
break
求1-100的所有數(shù)的和
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
value = 0
i = 1
while i < 101:
value = value + i
i += 1
print(value)
輸出 1-100 內(nèi)的所有奇數(shù)
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
i = 1
while i < 101:
if i % 2 == 1:
print(i)
i += 1
輸出 1-100 內(nèi)的所有偶數(shù)
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
i = 1
while i < 101:
if i % 2 == 0:
print(i)
i += 1
求1-2+3-4+5 ... 99的所有數(shù)的和
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
value = 0
i = 1
while i < 100:
if i % 2 == 1:
value = value + i
i += 1
elif i % 2 == 0:
value = value - i
i +=1
print(value)
用戶登陸（三次機會重試）
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
i = 0
while i < 3:
username = input("請輸入用戶名：")
password = input("請輸入密碼：")
if username == "fcc" and password == "123":
print("歡迎登陸！")
break
else:
print("用戶名或密碼錯誤")
i += 1
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